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Acer appears to have a Media Center Edition PC they've been keeping from us Yanks: the Acer Aspires L200. I couldn't find any actual dimensions of the machine, but as the article says, it looks to be about the same size as a DVD player. Considering the specs inside, it would be worth taking a look at if Acer ever bothers to bring it across the pond.

Acer Aspires L200 Set-Top Style MCE PC [eHomeUpgrade]